| LFP power spectra in V1 cortex: the graded effect of stimulus contrast. | |
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MedLine Citation:
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PMID: 15703230 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We recorded local field potentials (LFPs) and single-unit activity simultaneously in the macaque primary visual cortex (V1) and studied their responses to drifting sinusoidal gratings that were chosen to be "optimal" for the single units. Over all stimulus conditions, the LFP spectra have much greater power in the low-frequency band (< or = 10 Hz) than higher frequencies and can be described as "1/f." Analysis of the total power limited to the low, gamma (25-90 Hz), or broad (8-240 Hz) frequency bands of the LFP as a function of stimulus contrast indicates that the LFP power gradually increases with stimulus strength across a wide band in a manner roughly comparable to the increase in the simultaneously recorded spike activity. However, the low-frequency band power remains approximately constant across all stimulus contrasts. More specifically the gamma-band LFP power increases differentially more with respect to baseline than either higher or lower bands as stimulus contrast increases. At the highest stimulus contrasts, we report as others have previously, that the power spectrum of the LFP typically contains an obvious peak in the gamma-frequency band. The gamma-band peak emerges from the overall broadband enhancement in LFP power at stimulus contrasts where most single units' responses have begun to saturate. The temporal/spectral structures of the LFP located in the gamma band-which become most evident at the highest contrasts-provide additional constraints on potential mechanisms underlying the stimulus response properties of spiking neurons in V1. |
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Authors:
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J Andrew Henrie; Robert Shapley |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, P.H.S. Date: 2005-02-09 |
Journal Detail:
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Title: Journal of neurophysiology Volume: 94 ISSN: 0022-3077 ISO Abbreviation: J. Neurophysiol. Publication Date: 2005 Jul |
Date Detail:
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Created Date: 2005-06-29 Completed Date: 2005-08-16 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0375404 Medline TA: J Neurophysiol Country: United States |
Other Details:
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Languages: eng Pagination: 479-90 Citation Subset: IM |
Affiliation:
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Center for Neural Science, New York University, 4 Washington Place, Rm 809, New York, New York 10003, USA. jah@cns.nyu.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Action Potentials
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physiology Animals Dose-Response Relationship, Radiation Electroencephalography / methods Evoked Potentials, Visual / physiology* Macaca fascicularis Neurons / physiology Photic Stimulation* Spectrum Analysis* Visual Cortex / cytology, physiology* Visual Perception / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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R01 EY-08300/EY/NEI NIH HHS; R01-EY01472/EY/NEI NIH HHS; T32 EY-07158/EY/NEI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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